There are a number of people who do not like bitcoin, but the reason is because they do not understand what bitcoin is and what it can do for them. Some think it is for black market scams and such, but this is not the case. They need to learn and be educated!
As you've mentioned, it is used in "black market", it doesn't actually mean that they experienced how to use bitcoin to know those things, and sometimes those things that are happening in the internet which sometimes looks alien to them is what's keeping them away from bitcoin and won't open up to know bitcoin... It will take time before they would fully understand bitcoin...
